what is variable valency?
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Mᴇᴛᴀʟs Dᴏɴᴀᴛᴇ Eʟᴇᴄᴛʀᴏɴs Fʀᴏᴍ Tʜᴇɪʀ Vᴀʟᴇɴᴄᴇ Sʜᴇʟʟ Sᴏ As Tᴏ Fᴏʀᴍ Pᴏsɪᴛɪᴠᴇʟʏ Cʜᴀʀɢᴇᴅ Iᴏɴs Sᴜᴄʜ Tʜᴀᴛ Tʜᴇ Cʜᴀʀɢᴇ Oɴ Tʜᴇ Iᴏɴ Is Eǫᴜᴀʟ Tᴏ Iᴛs Eʟᴇᴄᴛʀᴏᴘᴏsɪᴛɪᴠᴇ Vᴀʟᴇɴᴄʏ. Iɴ Sᴜᴄʜ A Sɪᴛᴜᴀᴛɪᴏɴ Tʜᴇ Eʟᴇᴍᴇɴᴛ Exʜɪʙɪᴛs Mᴏʀᴇ Tʜᴀɴ Oɴᴇ Vᴀʟᴇɴᴄʏ (Vᴀʀɪᴀʙʟᴇ Vᴀʟᴇɴᴄʏ).
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Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. This is termed variable valency.
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